2 * Linux video grab interface
3 * Copyright (c) 2000,2001 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include <sys/ioctl.h>
25 #define _LINUX_TIME_H 1
26 #include <linux/videodev.h>
31 int frame_format; /* see VIDEO_PALETTE_xxx */
38 struct video_capability video_cap;
39 struct video_audio audio_saved;
41 struct video_mbuf gb_buffers;
42 struct video_mmap gb_buf;
45 /* ATI All In Wonder specific stuff */
46 /* XXX: remove and merge in libavcodec/imgconvert.c */
54 static int aiw_init(VideoData *s);
55 static int aiw_read_picture(VideoData *s, uint8_t *data);
56 static int aiw_close(VideoData *s);
58 static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
60 VideoData *s = s1->priv_data;
63 int video_fd, frame_size;
64 int ret, frame_rate, frame_rate_base;
65 int desired_palette, desired_depth;
66 struct video_tuner tuner;
67 struct video_audio audio;
68 struct video_picture pict;
69 const char *video_device;
72 if (ap->width <= 0 || ap->height <= 0 || ap->time_base.den <= 0) {
73 av_log(s1, AV_LOG_ERROR, "Bad capture size (%dx%d) or wrong time base (%d)\n",
74 ap->width, ap->height, ap->time_base.den);
81 frame_rate = ap->time_base.den;
82 frame_rate_base = ap->time_base.num;
84 if((unsigned)width > 32767 || (unsigned)height > 32767) {
85 av_log(s1, AV_LOG_ERROR, "Capture size is out of range: %dx%d\n",
91 st = av_new_stream(s1, 0);
94 av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
98 s->frame_rate = frame_rate;
99 s->frame_rate_base = frame_rate_base;
101 video_device = ap->device;
103 video_device = "/dev/video";
104 video_fd = open(video_device, O_RDWR);
106 perror(video_device);
110 if (ioctl(video_fd,VIDIOCGCAP, &s->video_cap) < 0) {
111 perror("VIDIOCGCAP");
115 if (!(s->video_cap.type & VID_TYPE_CAPTURE)) {
116 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not handle capture\n");
120 desired_palette = -1;
122 if (ap->pix_fmt == PIX_FMT_YUV420P) {
123 desired_palette = VIDEO_PALETTE_YUV420P;
125 } else if (ap->pix_fmt == PIX_FMT_YUV422) {
126 desired_palette = VIDEO_PALETTE_YUV422;
128 } else if (ap->pix_fmt == PIX_FMT_BGR24) {
129 desired_palette = VIDEO_PALETTE_RGB24;
133 /* set tv standard */
134 if (ap->standard && !ioctl(video_fd, VIDIOCGTUNER, &tuner)) {
135 if (!strcasecmp(ap->standard, "pal"))
136 tuner.mode = VIDEO_MODE_PAL;
137 else if (!strcasecmp(ap->standard, "secam"))
138 tuner.mode = VIDEO_MODE_SECAM;
140 tuner.mode = VIDEO_MODE_NTSC;
141 ioctl(video_fd, VIDIOCSTUNER, &tuner);
146 ioctl(video_fd, VIDIOCGAUDIO, &audio);
147 memcpy(&s->audio_saved, &audio, sizeof(audio));
148 audio.flags &= ~VIDEO_AUDIO_MUTE;
149 ioctl(video_fd, VIDIOCSAUDIO, &audio);
151 ioctl(video_fd, VIDIOCGPICT, &pict);
153 printf("v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
160 /* try to choose a suitable video format */
161 pict.palette = desired_palette;
162 pict.depth= desired_depth;
163 if (desired_palette == -1 || (ret = ioctl(video_fd, VIDIOCSPICT, &pict)) < 0) {
164 pict.palette=VIDEO_PALETTE_YUV420P;
166 ret = ioctl(video_fd, VIDIOCSPICT, &pict);
168 pict.palette=VIDEO_PALETTE_YUV422;
170 ret = ioctl(video_fd, VIDIOCSPICT, &pict);
172 pict.palette=VIDEO_PALETTE_RGB24;
174 ret = ioctl(video_fd, VIDIOCSPICT, &pict);
181 ret = ioctl(video_fd,VIDIOCGMBUF,&s->gb_buffers);
183 /* try to use read based access */
184 struct video_window win;
194 ioctl(video_fd, VIDIOCSWIN, &win);
196 s->frame_format = pict.palette;
199 ioctl(video_fd, VIDIOCCAPTURE, &val);
201 s->time_frame = av_gettime() * s->frame_rate / s->frame_rate_base;
204 /* ATI All In Wonder automatic activation */
205 if (!strcmp(s->video_cap.name, "Km")) {
209 /* force 420P format because convertion from YUV422 to YUV420P
210 is done in this driver (ugly) */
211 s->frame_format = VIDEO_PALETTE_YUV420P;
214 s->video_buf = mmap(0,s->gb_buffers.size,PROT_READ|PROT_WRITE,MAP_SHARED,video_fd,0);
215 if ((unsigned char*)-1 == s->video_buf) {
220 s->time_frame = av_gettime() * s->frame_rate / s->frame_rate_base;
222 /* start to grab the first frame */
223 s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames;
224 s->gb_buf.height = height;
225 s->gb_buf.width = width;
226 s->gb_buf.format = pict.palette;
228 ret = ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
230 if (errno != EAGAIN) {
232 av_log(s1, AV_LOG_ERROR, "Fatal: grab device does not support suitable format\n");
234 av_log(s1, AV_LOG_ERROR,"Fatal: grab device does not receive any video signal\n");
238 for (j = 1; j < s->gb_buffers.frames; j++) {
240 ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
242 s->frame_format = s->gb_buf.format;
246 switch(s->frame_format) {
247 case VIDEO_PALETTE_YUV420P:
248 frame_size = (width * height * 3) / 2;
249 st->codec->pix_fmt = PIX_FMT_YUV420P;
251 case VIDEO_PALETTE_YUV422:
252 frame_size = width * height * 2;
253 st->codec->pix_fmt = PIX_FMT_YUV422;
255 case VIDEO_PALETTE_RGB24:
256 frame_size = width * height * 3;
257 st->codec->pix_fmt = PIX_FMT_BGR24; /* NOTE: v4l uses BGR24, not RGB24 ! */
263 s->frame_size = frame_size;
265 st->codec->codec_type = CODEC_TYPE_VIDEO;
266 st->codec->codec_id = CODEC_ID_RAWVIDEO;
267 st->codec->width = width;
268 st->codec->height = height;
269 st->codec->time_base.den = frame_rate;
270 st->codec->time_base.num = frame_rate_base;
271 st->codec->bit_rate = frame_size * 1/av_q2d(st->codec->time_base) * 8;
281 static int v4l_mm_read_picture(VideoData *s, uint8_t *buf)
285 while (ioctl(s->fd, VIDIOCSYNC, &s->gb_frame) < 0 &&
286 (errno == EAGAIN || errno == EINTR));
288 ptr = s->video_buf + s->gb_buffers.offsets[s->gb_frame];
289 memcpy(buf, ptr, s->frame_size);
291 /* Setup to capture the next frame */
292 s->gb_buf.frame = s->gb_frame;
293 if (ioctl(s->fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
295 av_log(NULL, AV_LOG_ERROR, "Cannot Sync\n");
297 perror("VIDIOCMCAPTURE");
301 /* This is now the grabbing frame */
302 s->gb_frame = (s->gb_frame + 1) % s->gb_buffers.frames;
304 return s->frame_size;
307 static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
309 VideoData *s = s1->priv_data;
310 int64_t curtime, delay;
313 /* Calculate the time of the next frame */
314 s->time_frame += int64_t_C(1000000);
316 /* wait based on the frame rate */
318 curtime = av_gettime();
319 delay = s->time_frame * s->frame_rate_base / s->frame_rate - curtime;
321 if (delay < int64_t_C(-1000000) * s->frame_rate_base / s->frame_rate) {
322 /* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */
323 s->time_frame += int64_t_C(1000000);
327 ts.tv_sec = delay / 1000000;
328 ts.tv_nsec = (delay % 1000000) * 1000;
329 nanosleep(&ts, NULL);
332 if (av_new_packet(pkt, s->frame_size) < 0)
338 if (s->aiw_enabled) {
339 return aiw_read_picture(s, pkt->data);
340 } else if (s->use_mmap) {
341 return v4l_mm_read_picture(s, pkt->data);
343 if (read(s->fd, pkt->data, pkt->size) != pkt->size)
345 return s->frame_size;
349 static int grab_read_close(AVFormatContext *s1)
351 VideoData *s = s1->priv_data;
357 munmap(s->video_buf, s->gb_buffers.size);
359 /* mute audio. we must force it because the BTTV driver does not
360 return its state correctly */
361 s->audio_saved.flags |= VIDEO_AUDIO_MUTE;
362 ioctl(s->fd, VIDIOCSAUDIO, &s->audio_saved);
368 AVInputFormat video_grab_device_demuxer = {
376 .flags = AVFMT_NOFILE,
379 /* All in Wonder specific stuff */
380 /* XXX: remove and merge in libavcodec/imgconvert.c */
382 static int aiw_init(VideoData *s)
389 if ((width == s->video_cap.maxwidth && height == s->video_cap.maxheight) ||
390 (width == s->video_cap.maxwidth && height == s->video_cap.maxheight*2) ||
391 (width == s->video_cap.maxwidth/2 && height == s->video_cap.maxheight)) {
395 if (height == s->video_cap.maxheight*2) s->deint=1;
396 if (width == s->video_cap.maxwidth/2) s->halfw=1;
398 av_log(NULL, AV_LOG_ERROR, "\nIncorrect Grab Size Supplied - Supported Sizes Are:\n");
399 av_log(NULL, AV_LOG_ERROR, " %dx%d %dx%d %dx%d\n\n",
400 s->video_cap.maxwidth,s->video_cap.maxheight,
401 s->video_cap.maxwidth,s->video_cap.maxheight*2,
402 s->video_cap.maxwidth/2,s->video_cap.maxheight);
407 s->src_mem = av_malloc(s->width*2);
409 s->src_mem = av_malloc(s->width*4);
411 if (!s->src_mem) goto fail;
413 s->lum_m4_mem = av_malloc(s->width);
418 av_freep(&s->src_mem);
419 av_freep(&s->lum_m4_mem);
424 #include "libavcodec/i386/mmx.h"
426 #define LINE_WITH_UV \
427 movq_m2r(ptr[0],mm0); \
428 movq_m2r(ptr[8],mm1); \
429 movq_r2r(mm0, mm4); \
430 punpcklbw_r2r(mm1,mm0); \
431 punpckhbw_r2r(mm1,mm4); \
433 punpcklbw_r2r(mm4,mm0); \
434 punpckhbw_r2r(mm4,mm5); \
436 punpcklbw_r2r(mm5,mm1); \
437 movq_r2m(mm1,lum[0]); \
438 movq_m2r(ptr[16],mm2); \
439 movq_m2r(ptr[24],mm1); \
441 punpcklbw_r2r(mm1,mm2); \
442 punpckhbw_r2r(mm1,mm4); \
444 punpcklbw_r2r(mm4,mm2); \
445 punpckhbw_r2r(mm4,mm3); \
447 punpcklbw_r2r(mm3,mm1); \
448 movq_r2m(mm1,lum[8]); \
449 punpckhdq_r2r(mm2,mm0); \
450 punpckhdq_r2r(mm3,mm5); \
451 movq_r2m(mm0,cb[0]); \
455 movq_m2r(ptr[0],mm0);\
456 movq_m2r(ptr[8],mm1);\
458 punpcklbw_r2r(mm1,mm0); \
459 punpckhbw_r2r(mm1,mm4);\
461 punpcklbw_r2r(mm4,mm0);\
462 punpckhbw_r2r(mm4,mm5);\
464 punpcklbw_r2r(mm5,mm1);\
465 movq_r2m(mm1,lum[0]);\
466 movq_m2r(ptr[16],mm2);\
467 movq_m2r(ptr[24],mm1);\
469 punpcklbw_r2r(mm1,mm2);\
470 punpckhbw_r2r(mm1,mm4);\
472 punpcklbw_r2r(mm4,mm2);\
473 punpckhbw_r2r(mm4,mm3);\
475 punpcklbw_r2r(mm3,mm1);\
476 movq_r2m(mm1,lum[8]);
478 #define LINE_WITHUV_AVG \
479 movq_m2r(ptr[0], mm0);\
480 movq_m2r(ptr[8], mm1);\
482 punpcklbw_r2r(mm1,mm0);\
483 punpckhbw_r2r(mm1,mm4);\
485 punpcklbw_r2r(mm4,mm0);\
486 punpckhbw_r2r(mm4,mm5);\
489 punpcklbw_r2r(mm7,mm1);\
490 punpcklbw_r2r(mm7,mm2);\
494 packuswb_r2r(mm7,mm1);\
495 movd_r2m(mm1,lum[0]);\
496 movq_m2r(ptr[16],mm2);\
497 movq_m2r(ptr[24],mm1);\
499 punpcklbw_r2r(mm1,mm2);\
500 punpckhbw_r2r(mm1,mm4);\
502 punpcklbw_r2r(mm4,mm2);\
503 punpckhbw_r2r(mm4,mm3);\
506 punpcklbw_r2r(mm7,mm1);\
507 punpcklbw_r2r(mm7,mm4);\
511 packuswb_r2r(mm7,mm1);\
512 movd_r2m(mm1,lum[4]);\
513 punpckhbw_r2r(mm7,mm0);\
514 punpckhbw_r2r(mm7,mm2);\
518 packuswb_r2r(mm7,mm0);\
519 punpckhbw_r2r(mm7,mm5);\
520 punpckhbw_r2r(mm7,mm3);\
524 packuswb_r2r(mm7,mm5);\
525 movd_r2m(mm0,cb[0]);\
528 #define LINE_NOUV_AVG \
529 movq_m2r(ptr[0],mm0);\
530 movq_m2r(ptr[8],mm1);\
533 pmaddwd_r2r(mm6,mm0);\
534 pmaddwd_r2r(mm6,mm1);\
535 packssdw_r2r(mm1,mm0);\
538 movq_m2r(ptr[16],mm2);\
539 movq_m2r(ptr[24],mm3);\
542 pmaddwd_r2r(mm6,mm2);\
543 pmaddwd_r2r(mm6,mm3);\
544 packssdw_r2r(mm3,mm2);\
547 packuswb_r2r(mm2,mm0);\
548 movq_r2m(mm0,lum[0]);
550 #define DEINT_LINE_LUM(ptroff) \
551 movd_m2r(lum_m4[(ptroff)],mm0);\
552 movd_m2r(lum_m3[(ptroff)],mm1);\
553 movd_m2r(lum_m2[(ptroff)],mm2);\
554 movd_m2r(lum_m1[(ptroff)],mm3);\
555 movd_m2r(lum[(ptroff)],mm4);\
556 punpcklbw_r2r(mm7,mm0);\
557 movd_r2m(mm2,lum_m4[(ptroff)]);\
558 punpcklbw_r2r(mm7,mm1);\
559 punpcklbw_r2r(mm7,mm2);\
560 punpcklbw_r2r(mm7,mm3);\
561 punpcklbw_r2r(mm7,mm4);\
569 psubusw_r2r(mm0,mm1);\
571 packuswb_r2r(mm7,mm1);\
572 movd_r2m(mm1,lum_m2[(ptroff)]);
575 #include "libavcodec/dsputil.h"
577 #define LINE_WITH_UV \
578 lum[0]=ptr[0];lum[1]=ptr[2];lum[2]=ptr[4];lum[3]=ptr[6];\
579 cb[0]=ptr[1];cb[1]=ptr[5];\
580 cr[0]=ptr[3];cr[1]=ptr[7];\
581 lum[4]=ptr[8];lum[5]=ptr[10];lum[6]=ptr[12];lum[7]=ptr[14];\
582 cb[2]=ptr[9];cb[3]=ptr[13];\
583 cr[2]=ptr[11];cr[3]=ptr[15];\
584 lum[8]=ptr[16];lum[9]=ptr[18];lum[10]=ptr[20];lum[11]=ptr[22];\
585 cb[4]=ptr[17];cb[5]=ptr[21];\
586 cr[4]=ptr[19];cr[5]=ptr[23];\
587 lum[12]=ptr[24];lum[13]=ptr[26];lum[14]=ptr[28];lum[15]=ptr[30];\
588 cb[6]=ptr[25];cb[7]=ptr[29];\
589 cr[6]=ptr[27];cr[7]=ptr[31];
592 lum[0]=ptr[0];lum[1]=ptr[2];lum[2]=ptr[4];lum[3]=ptr[6];\
593 lum[4]=ptr[8];lum[5]=ptr[10];lum[6]=ptr[12];lum[7]=ptr[14];\
594 lum[8]=ptr[16];lum[9]=ptr[18];lum[10]=ptr[20];lum[11]=ptr[22];\
595 lum[12]=ptr[24];lum[13]=ptr[26];lum[14]=ptr[28];lum[15]=ptr[30];
597 #define LINE_WITHUV_AVG \
598 sum=(ptr[0]+ptr[2]+1) >> 1;lum[0]=sum; \
599 sum=(ptr[4]+ptr[6]+1) >> 1;lum[1]=sum; \
600 sum=(ptr[1]+ptr[5]+1) >> 1;cb[0]=sum; \
601 sum=(ptr[3]+ptr[7]+1) >> 1;cr[0]=sum; \
602 sum=(ptr[8]+ptr[10]+1) >> 1;lum[2]=sum; \
603 sum=(ptr[12]+ptr[14]+1) >> 1;lum[3]=sum; \
604 sum=(ptr[9]+ptr[13]+1) >> 1;cb[1]=sum; \
605 sum=(ptr[11]+ptr[15]+1) >> 1;cr[1]=sum; \
606 sum=(ptr[16]+ptr[18]+1) >> 1;lum[4]=sum; \
607 sum=(ptr[20]+ptr[22]+1) >> 1;lum[5]=sum; \
608 sum=(ptr[17]+ptr[21]+1) >> 1;cb[2]=sum; \
609 sum=(ptr[19]+ptr[23]+1) >> 1;cr[2]=sum; \
610 sum=(ptr[24]+ptr[26]+1) >> 1;lum[6]=sum; \
611 sum=(ptr[28]+ptr[30]+1) >> 1;lum[7]=sum; \
612 sum=(ptr[25]+ptr[29]+1) >> 1;cb[3]=sum; \
613 sum=(ptr[27]+ptr[31]+1) >> 1;cr[3]=sum;
615 #define LINE_NOUV_AVG \
616 sum=(ptr[0]+ptr[2]+1) >> 1;lum[0]=sum; \
617 sum=(ptr[4]+ptr[6]+1) >> 1;lum[1]=sum; \
618 sum=(ptr[8]+ptr[10]+1) >> 1;lum[2]=sum; \
619 sum=(ptr[12]+ptr[14]+1) >> 1;lum[3]=sum; \
620 sum=(ptr[16]+ptr[18]+1) >> 1;lum[4]=sum; \
621 sum=(ptr[20]+ptr[22]+1) >> 1;lum[5]=sum; \
622 sum=(ptr[24]+ptr[26]+1) >> 1;lum[6]=sum; \
623 sum=(ptr[28]+ptr[30]+1) >> 1;lum[7]=sum;
625 #define DEINT_LINE_LUM(ptroff) \
626 sum=(-lum_m4[(ptroff)]+(lum_m3[(ptroff)]<<2)+(lum_m2[(ptroff)]<<1)+(lum_m1[(ptroff)]<<2)-lum[(ptroff)]); \
627 lum_m4[(ptroff)]=lum_m2[(ptroff)];\
628 lum_m2[(ptroff)]=cm[(sum+4)>>3];\
629 sum=(-lum_m4[(ptroff)+1]+(lum_m3[(ptroff)+1]<<2)+(lum_m2[(ptroff)+1]<<1)+(lum_m1[(ptroff)+1]<<2)-lum[(ptroff)+1]); \
630 lum_m4[(ptroff)+1]=lum_m2[(ptroff)+1];\
631 lum_m2[(ptroff)+1]=cm[(sum+4)>>3];\
632 sum=(-lum_m4[(ptroff)+2]+(lum_m3[(ptroff)+2]<<2)+(lum_m2[(ptroff)+2]<<1)+(lum_m1[(ptroff)+2]<<2)-lum[(ptroff)+2]); \
633 lum_m4[(ptroff)+2]=lum_m2[(ptroff)+2];\
634 lum_m2[(ptroff)+2]=cm[(sum+4)>>3];\
635 sum=(-lum_m4[(ptroff)+3]+(lum_m3[(ptroff)+3]<<2)+(lum_m2[(ptroff)+3]<<1)+(lum_m1[(ptroff)+3]<<2)-lum[(ptroff)+3]); \
636 lum_m4[(ptroff)+3]=lum_m2[(ptroff)+3];\
637 lum_m2[(ptroff)+3]=cm[(sum+4)>>3];
642 /* Read two fields separately. */
643 static int aiw_read_picture(VideoData *s, uint8_t *data)
645 uint8_t *ptr, *lum, *cb, *cr;
650 uint8_t* src = s->src_mem;
651 uint8_t *ptrend = &src[s->width*2];
653 cb=&lum[s->width*s->height];
654 cr=&cb[(s->width*s->height)/4];
655 if (s->deint == 0 && s->halfw == 0) {
656 while (read(s->fd,src,s->width*2) < 0) {
659 for (h = 0; h < s->height-2; h+=2) {
660 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
663 read(s->fd,src,s->width*2);
664 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16) {
667 read(s->fd,src,s->width*2);
672 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
675 read(s->fd,src,s->width*2);
676 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16) {
679 /* drop second field */
680 while (read(s->fd,src,s->width*2) < 0) {
683 for (h = 0; h < s->height - 1; h++) {
684 read(s->fd,src,s->width*2);
686 } else if (s->halfw == 1) {
703 movq_m2r(rounder,mm6);
705 while (read(s->fd,src,s->width*4) < 0) {
708 ptrend = &src[s->width*4];
709 for (h = 0; h < s->height-2; h+=2) {
710 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=8, cb+=4, cr+=4) {
713 read(s->fd,src,s->width*4);
715 movq_m2r(masker,mm5);
717 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=8) {
720 read(s->fd,src,s->width*4);
725 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=8, cb+=4, cr+=4) {
728 read(s->fd,src,s->width*4);
730 movq_m2r(masker,mm5);
732 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=8) {
735 /* drop second field */
736 while (read(s->fd,src,s->width*4) < 0) {
739 for (h = 0; h < s->height - 1; h++) {
740 read(s->fd,src,s->width*4);
743 uint8_t *lum_m1, *lum_m2, *lum_m3, *lum_m4;
750 movq_m2r(rounder,mm6);
753 uint8_t *cm = cropTbl + MAX_NEG_CROP;
756 /* read two fields and deinterlace them */
757 while (read(s->fd,src,s->width*2) < 0) {
760 for (h = 0; h < (s->height/2)-2; h+=2) {
761 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
764 read(s->fd,src,s->width*2);
765 /* skip a luminance line - will be filled in later */
767 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
770 /* skip a luminance line - will be filled in later */
772 read(s->fd,src,s->width*2);
777 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
780 /* skip a luminance line - will be filled in later */
782 read(s->fd,src,s->width*2);
783 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
792 while (read(s->fd,src,s->width*2) < 0) {
795 /* First (and last) two lines not interlaced */
796 for (h = 0; h < 2; h++) {
797 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16) {
800 read(s->fd,src,s->width*2);
801 /* skip a luminance line */
804 lum_m1=&lum[-s->width];
805 lum_m2=&lum_m1[-s->width];
806 lum_m3=&lum_m2[-s->width];
807 memmove(s->lum_m4_mem,&lum_m3[-s->width],s->width);
808 for (; h < (s->height/2)-1; h++) {
809 lum_m4=s->lum_m4_mem;
810 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16,lum_m1+=16,lum_m2+=16,lum_m3+=16,lum_m4+=16) {
818 read(s->fd,src,s->width*2);
819 /* skip a luminance line */
824 // lum_m4 += s->width;
829 lum_m4=s->lum_m4_mem;
830 for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, lum_m1+=16, lum_m2+=16, lum_m3+=16, lum_m4+=16) {
842 return s->frame_size;
845 static int aiw_close(VideoData *s)
847 av_freep(&s->lum_m4_mem);
848 av_freep(&s->src_mem);